docs: def fill_view(self, view):
          """
          Fill this histogram from a view of another histogram
          """
          other = view.hist
          _other_x_center = other.axis(0).GetBinCenter
          _other_y_center = other.axis(1).GetBinCenter
          _other_z_center = other.axis(2).GetBinCenter
          _other_get = other.GetBinContent
          _other_get_bin = super(_HistBase, other).GetBin
          other_sum_w2 = other.GetSumw2()
          _other_sum_w2_at = other_sum_w2.At
  
          _find = self.FindBin
          sum_w2 = self.GetSumw2()
          _sum_w2_at = sum_w2.At
          _sum_w2_setat = sum_w2.SetAt
          _set = self.SetBinContent
          _get = self.GetBinContent
  
          for x, y, z in view.points:
              idx = _find(
                  _other_x_center(x),
                  _other_y_center(y),
                  _other_z_center(z))
              other_idx = _other_get_bin(x, y, z)
              _set(idx, _get(idx) + _other_get(other_idx))
              _sum_w2_setat(
                  _sum_w2_at(idx) + _other_sum_w2_at(other_idx),
                  idx)